MESON Chess Problem Database

Problem Display
PID: 102148 (4k3/1N1p3K/4q2b/2BQ2N1/8/4R3/8/4r3 w - - 0 1)

Jenssen, August

Dagbladet, 1958

4k3/1N1p3K/4q2b/2BQ2N1/8/4R3/8/4r3

#2

6 + 5

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe3
      • 2.Qf7#
    • 1...Qe4+
      • 2.Qxe4#
    • 1...Qe5
      • 2.Qf7#
      • 2.Qxe5#
    • 1...Qe7+
      • 2.Qf7#
  • Tries
    • 1.Rxe6+?
      • 1...dxe6
        • 2.Qc6#
        • 2.Qd8#
      • 1...Rxe6!
  • Keys
    • 1.Qd6!
      • threat
        • 2.Qb8#
      • 1...Qe4+
        • 2.Qg6#
      • 1...Qe7+
        • 2.Qxe7#
      • 1...Bxg5
        • 2.Qf8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • Q(b);N_SPINQ(b),OGATE,XR(A)::QAB1(C)
    • Q(b);CHECK,OGATEB::QAR(C),XQ(b)
    • Q(b);CHECK,OGATE::QAB1(C)
  • Tries
    • Try
      • R(A);CHECK,XQ(b)
      • Refutation
        • R(a);XR(A)
  • Actual
    • Q(C);
    • Threat
      • QAR(C)
    • Vars
      • Q(b);CHECK,OGATE::QAB(C)
      • Q(b);CHECK,N_GUARD::QAR1(C),XQ(b)
      • B(c);N_GUARD,XS(D)::QAR1(C)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).